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Related Parties - Sponsor and Trustee - Additional Information (Detail)		10 Months Ended	12 Months Ended
	Jul. 17, 2015	Jul. 16, 2015 USD ($) oz	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)
Sponsor [Member]
Related Party Transaction [Line Items]
Related party fees payable at annual rate	0.40%	0.15%
Custodian Tier One [Member]
Related Party Transaction [Line Items]
Related party fees payable at annual rate		0.10%
Custodian Tier One [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Aggregate weight of gold to determine custodian fee tiers | oz		4,500,000
Custodian Tier Two [Member]
Related Party Transaction [Line Items]
Related party fees payable at annual rate		0.06%
Custodian Tier Two [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Aggregate weight of gold to determine custodian fee tiers | oz		4,500,000
Marketing Agent [Member]
Related Party Transaction [Line Items]
Related party fees payable at annual rate		0.15%
Sponsor and Marketing Agent [Member]
Related Party Transaction [Line Items]
Trust expense ratio		0.40%
Fees waived amount		$ 2,047,695	$ 0	$ 0
Trustee [Member]
Related Party Transaction [Line Items]
Related party fees payable at annual rate		0.02%
Trustee [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Related party service fees		$ 2,000,000
Trustee [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Related party service fees		$ 500,000

X

- Definition

Aggregate weight of gold used to determine appropriate custodian fee tier to use in calculating custodian fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	gld_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Discussion that relates to the approximate assets under management below which the ordinary expenses will accrue at a rate greater than the expense ratio.

+ References

No definition available.

+ Details

Name:	gld_MinimumAccountingRateOfOrdinaryExpensesAfterTakingAffectOfCurrentExpenses
Namespace Prefix:	gld_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The reduction in the Sponsor's and marketing agent's fees made to ensure that the total expenses charged to the Trust do not exceed the expense ratio of the Trust.

+ References

No definition available.

+ Details

Name:	gld_ReductionInFeesPayable
Namespace Prefix:	gld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Related party fees at the annual contractual rates charged on the daily adjusted net asset value of the Trust.

+ References

No definition available.

+ Details

Name:	gld_RelatedPartyFeesPayableAtAnnualRate
Namespace Prefix:	gld_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Related party service fees.

+ References

No definition available.

+ Details

Name:	gld_RelatedPartyServiceFees
Namespace Prefix:	gld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gld_SponsorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gld_CustodianTierOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gld_CustodianTierTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gld_MarketingAgentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gld_SponsorAndMarketingAgentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gld_TrusteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: